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How to Add Coolant to the
Coolant Recovery Tank
If you haven’t found a problem yet, but the coolant level
isn’t at the
ADD mark, add a 50/50 mixture of clean
water (preferably distilled) and DEX-COOL TM
(orange-colored, silicate-free) antifreeze at the coolant
recovery tank. (See “Engine Coolant”
in the Index for
more information.)
I
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle’s coolant warning
system
is set for the proper coolant mix. With
plain water or the wrong
mix, your engine could
get too hot but you wouldn’t get the overheat
warning. Your engine could catch fire and you or
others could be burned. Use a
50/50 mix of clean
water and
DEX-COOL TM antifreeze.
I NOTICE:
r
In cold weather, water can freeze and crack the
engine, radiator, heater core and other parts. Use the recommended coolant and the proper
coolant mix.
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You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and
it will burn if the engine parts are hot
enough. Don't spill coolant on
a hot engine.
When the coolant
in the coolant recovery tank is at
ADD, start your vehicle.
If the overheat warning continues, there's one more
thing you can try. You can add the proper coolant
mix
directly to the radiator but be sure the cooling system is
cool before you do it.
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the radiator
pressure cap
-- even a little -- they can come out
at high speed. Never turn the cap when the
cooling system, including the radiator pressure
cap, is hot. Wait for the cooling system and
radiator pressure cap to cool if you ever have to
turn the pressure cap.
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How to Add Coolant to the Radiator
1. You can remove the radiator pressure cap when the
cooling system, including the radiator pressure cap and
upper radiator hose. is no longer hot. Turn the pressure
cap slowly counterclockwise
until it first stops. (Don’t
press down while turning
the pressure cap.)
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
2. Then keep turning the pressure cap, but now push
down as you
turn it. Remove the pressure cap.
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Page 198 of 340
3. Fill the radiator with the proper mix, up to the base
of the filler neck. 4. Then fill the coolant recovery tank to the ADD mark.
5. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap off.
5-18
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6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine fan.
filler neck may be lower.
If the level is lower, add
more of the proper mix through the filler neck until
the level reaches the base of the filler neck.
7. By this time the coolant level inside the radiator
8. Then replace the pressure cap. At any time during I
this procedure if coolant begins to flow out of the
filler neck, reinstall the pressure cap. Be sure the.
arrows on the pressure cap line up like this.
5-19
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I
Lift the hood, release the hood prop from its retainer and
put the hood prop into the slot
in the hood. You may
have a lamp that comes on when you lift the hood.
Things that burn can get on hot engine parts and
start a fire. These include liquids like gasoline,
oil, coolant, brake fluid, windshield washer and
other fluids, and plastic
or rubber. You or others
could be burned. Be careful not to drop or spill
things that will burn onto
a hot engine.
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When you lift the hood, you’ll see these items:
A. Transmission Dipstick
B. Engine Oil
Fill
C. Brake Master Cylinder D.
Coolant Recovery Tank
E. Engine Oil Dipstick
E Power Steering Reservoir
G. Battery
H. Air Cleaner
I. Windshield Washer Fluid
6-8
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Page 231 of 340

Rear Axle What to Use
When to Check and Change Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant and when to change it. See
“Scheduled Maintenance Services”
in the Index.
How to Check Lubricant
If the level is below the bottom of the filler plug hole,
you’ll need to add some lubricant. Add enough lubricant
to raise the level
to the bottom of the filler plug hole. Refer to the Maintenance
Schedule to determine what
kind of lubricant to use. See “Recommended Fluids and
Lubricants”
in the Index.
Engine Coolant
The cooling system in your vehicle is filled with new
DEX-COOL TM (orange-colored, silicate-free) engine
coolant. This coolant
is designed to remain in your
vehicle for
S years or 100,000 miles (1 66 000 km),
whichever occurs first.
The following explains your cooling system and
how to
add coolant when it is low. If you have a problem with
engine overheating, see “Engine Overheating”
in
the Index.
A SO/SO mixture of water and the proper coolant for
your Oldsmobile
will:
0 Give freezing protection down to -34°F (-37°C).
0 Give boiling protection up to 265°F (129°C).
0 Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as
they should.
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